Once you obtain all of the green stars, stamps, and earn a golden flag on all stages, you'll gain access to World Crown, which includes Champion's Road, Captain Toad's Fiery Finale, and Mystery House Marathon.
Toad House Tip
If the best power-ups are in the big box, the pattern is small-big-small-big. If the best power-ups are in the small box, the pattern is big-small-big.
World 4-2 Warp To World 5
The Cat Suit is required for this cheat, so have one handy in the inventory or nab it in the area. After exiting the underground portion (with the checkpoint flag) you will come out of a warp pipe with a clear mystery box. Run up the wall that it is touching to reach the top of the waterfall. After jumping across the poisonous water, there will be red warp pipe. This will warp you to World 5!
You can get three crowns-worth of lives, or 1,110 lives, in World 1-2. You can do this by passing the first Koopa and making your way to the area with a second Koopa and a Goomba on a slightly raised platform. Kill the Goomba, then jump on the green Koopa and steal its shell. Hop up onto the platform with the Goomba and face the rear wall while standing in front of the three brick blocks (press the D-pad UP to aim directly at the wall). Throw the Koopa and then immediately jump. Don't press anything else and you will bounce off the Koopa shell and never touch the ground while it bounces infinitely off the rear wall. This will result in infinite 1-Ups so long as you don't move!
You'll need to return to the level twice to fill up your lives to 1,110 because the time will run out once you hit 600 or so on your first go.
World 1-2 Warp To World 2
The Cat Suit is required for this cheat, so pick one up in World 1-1 Super Bell Hill and hold it in your inventory or wear it through the level. Near the end of the underground portion of the level is a pipe that splits into two paths, one with a loop with coins in it.
On the far side are three long ? blocks that are invisible against the rear wall. Use these to reach the upper path with a lone Koopa patrolling it. Above this Koopa is a hard-to-spot gap in the ceiling. Run up the rear wall to find a red warp pipe. This will warp you to World 2!
5 Profile Stars
You can get 5 Stars by your save profile in Super Mario 3D World. To get each star, complete the following challenges:
Beat Worlds 1-8
Get every Green Star in Worlds 1 through World Flower
Beat World Star, World Mushroom, and World Flower
Get every Green Star in the game
Get every Green Star, Gold Flagpole and Stamp (you must beat every world with every character, including Rosalina)
5 Final Stamps
5 Stamps are not collected in levels and appear to be portraits of the 5 main characters (including Rosalina).These stamps are only unlocked when you beat all levels with each character. For instance, if you beat every level with Mario, you will get the Mario Stamp.
If you play the game with multiple players, they all count for this challenge so long as they touch the end flag. This means that the shortest way to get all 85 Stamps is to play the game once with three characters playing at once, then play every level again with Rosalina and the remaining character.
Change Level Flags
If you reach the top of a flag pole, the flag on the map screen will turn gold instead of red. If you get all the Green Stars in a level, a spinning Green Star will appear above the flag pole.
Unlockable Character: Rosalina
Rosalina will be an unlockable playable character in Super Mario 3D World, as revealed in November 13th's Nintendo Direct. She'll have a special spin attack.
Unlockable Luigi Bros. Mini-Game
A modified version of the NES version of the classic Nintendo arcade game Mario Bros. called Luigi Bros. can be played from the menu screen of Super Mario 3D World. It is unclear how this game is unlocked at this point, but it will autmatically be unlocked early on Wii Us with New Super Luigi U saves on them. In it you can play as two different versions of Luigi simultaneously.
Be the Shell
While you are holding a shell, perform the ground pound move and suddenly you will be controlling the shell. Its color will change to match your character's standard tones (unless you're using a gold shell), and you can pass through clear pipes, flagpoles, checkpoints, enemies, and other players.
Giant 8-bit Luigi Easter Egg
In the first Boss battle with Bowser if you get the cat suit and then run up a wall you will see a giant bridge. If you keep watching the bridge a giant 8-bit Luigi will appear swimming under it.
There are many hidden Luigis throughout the entire game. They reside within levels, in the overworld maps and even within minigames! While it is not yet clear whether or not they appear within every single level there are more hidden Luigis than you can shake a stick at. Please edit this section with more information as to whether or not a save file from Super Luigi U is needed to activate these hidden bonuses or if they are there for everyone to celebrate The Year Of Luigi one last time!